I just had one (Convoy S2+ UV 365nm) shipped in and playing with it tonight. It is PHENOMENAL. If you are a germaphobe, don't buy this. It will either make you insane, or put you on a mission scrubbing and disinfecting everything for the rest of your life. It works really, really well detecting cat pee. (My cats? NEVER.) Bull crap. I couldn't believe what I saw. Shined it around the bathroom/toilet and was equally mortified. I have some cleaning to do this coming weekend LOL. I thought I was doing OK. My cats also play with those little rabbit-fur mousies you buy for a buck at the pet store. The light illuminates all the little rabbit-hair fibers in the carpet along the molding at the edge of the wall where the vacuum doesn't get to very well obviously. It really shows a lot of stuff that isn't visible to the naked eye.
I know they can be had for about 20-25 bucks direct from sellers in China, but I paid an ebay seller a bit more ($37.00) for a Florida shipped unit that was delivered in a couple days. Non-descript cheap packaging, but the light itself seems quite well made. Worth the extra buxx$$$ to me to have it in a few days rather than sweat the slow-boat delivery from China.
I lurked CPF a bit for recommendations on a UV light when I became interested in getting one, and this one seems to be a winner. Glad I took the advice of CPFr's on this one.